WO2000012050A1

WO2000012050A1 - Dental glue, glue injector, and device for detecting injected glue

Info

Publication number: WO2000012050A1
Application number: PCT/JP1999/003975
Authority: WO
Inventors: Kazunori Kusano
Original assignee: Kazunori Kusano
Priority date: 1998-08-30
Filing date: 1999-07-26
Publication date: 2000-03-09
Also published as: JP3501290B2; US6508647B2; US6537068B2; EP1027876A1; US20020168609A1; US20020045148A1; EP1027876A4

Abstract

A dental glue, glue injector, and device for detecting injected glue are disclosed. The dental glue contains an electroconductive material. The glue injector (1) can contain an electroconductive glue (D) and includes an electroconductive member for electrically connecting the electroconductive glue (D) to an external electrode. The device comprises a current detector (101) for measuring the current flowing through the electroconductive glue (D) contained in the injector (1) and a current indicator (105) for indicating the current.

Description

TECHNICAL FIELD The present invention relates to drugs, instruments and devices used for root canal treatment, and more particularly to a glue used for root canal filling. And a glue filling detecting device. BACKGROUND ART In dental clinical treatment, root canal treatment is often performed. Among them, root canal filling is an operation equivalent to finishing the root canal treatment, and greatly affects the prognosis of the affected tooth. At this time, since the length to the root canal stenosis varies individually depending on the patient, it is necessary to measure the root canal length. Conventionally, there are methods of measuring the actual length of teeth by performing X-ray photography using a reamer, file, measuring scale, etc. as a measuring needle.In recent years, pregnant women and others have been exposed to X-rays. Root canal length measurement methods using impedance measurement are widely used because they are sometimes undesirable and are quick and accurate.

In this root canal length measurement by impedance measurement, the impedance is usually measured in advance based on the conditions of the measuring device when the tip of the reamer comes into contact with the periodontal ligament using a root canal meter, etc. When this value is reached, the screw inserted into the root canal

—When the measured current or resistance value differs by a certain value from the force that is the working length equal to the length obtained by subtracting about l mm from the length of the mer or the value that indicates that it has come into contact with the periodontal ligament The length is set as the working length.

Conventionally, root canal filling materials used for such root canal fillings ゃ As root canal filling agents, those using gutta punch points and silver points in combination with various sealers, And a paste-type root canal filler containing a continuous disinfectant or a bone scar healing promoting agent or the like is used.

In particular, the above-mentioned technique for filling the root canal with glue is a method in which a hand-operated reamer or the like is rotated in the reverse direction to fill it, or a special device such as a spiral glue root canal filling device such as a Lenz mouth is used. Method, and a method of injecting with an injector such as a syringe. However, the use of a reamer or Lenz mouth requires extra work such as pre-measurement of the root canal length, and requires the use of special instruments. There is an inconvenience.

FIG. 9 is a diagram illustrating a conventional technique for filling a root canal with a glue using an injector. As shown in FIG. 9 (a), a filling syringe 1 filled with a glue M is used for a root canal filling operation using a conventional syringe. The glue injector 1 includes a storage section 2 and a press-fitting section 3 inserted into the storage section 2. A filler injection tube used as the filling unit 4 is attached to the tip of the storage unit 2, and the tip of the glue injection tube is inserted into the expanded root canal. It is shown.

In the conventional root canal filling procedure, as shown in Fig. 9 (b), while inserting a filler injection tube into the root canal of the affected tooth, insert the press-fitting part 3 in the direction indicated by arrow A. Push to fill the root canal with glue M. When filling is completed, the filler injection tube is withdrawn from the root canal, and the root canal filling procedure is completed.

In this way, if the glue is filled into the root canal using a filling syringe, there is an advantage that the operation for measuring the root canal length in advance is not required and the operation can be performed easily and quickly, It is unknown whether the glue has been reliably filled into the apical part, and if the glue is filled beyond the apical stenosis, it will stimulate the apical periodontal tissue. If it was too short, there were inconveniences such as residual medulla and the possibility of allowing a dead space at the apical tip. Therefore, there is a need for a glue, a glue injector and a glue filling detection device for performing a root canal filling in a quick, simple and more reliable manner. Disclosure of the invention The present inventor has conducted intensive studies on such a problem, and as a result, filled the root canal with a paste provided with a conductive member with a paste provided with conductivity by adding a conductive material. As a result, they found that it was possible to confirm that the glue was properly filled in the root canal using the same method as the impedance measurement used for measuring the working length, and completed the present invention.

The above object of the present invention is solved by using the paste, paste filler and root canal filling detecting device of the present invention.

That is, the first configuration of the present invention provides a dental paste characterized by adding a conductive material to a root canal filling paste.

In the first configuration of the present invention, it is preferable that the conductive material is a powder.

In the first configuration of the present invention, the conductive material is a metal powder, a metal oxide powder, a doped metal oxide powder, a metal, a metal oxide, or a metal doped with inorganic particles. It is preferably selected from the group consisting of conductive powder coated with a conductive material selected from oxides, carbon powder, force—bond force, and whisker to which metal is fixed.

In the first configuration of the present invention, it is preferable that the sizing agent for filling a root canal contains a compound selected from calcium hydroxide, hydroxyapatite, and tricalcium phosphate.

In the first configuration of the present invention, it is preferable that the glue for filling the root canal contains a compound selected from hordeform, barium sulfate, anhydrous zinc sulfate, aluminum sulfate, and zinc oxide.

In the first configuration of the present invention, the paste for filling a root canal preferably contains a vehicle selected from silicone oil, guaiacol formaldehyde mixture, propylene glycol, anhydrous ethanol, castor oil, and liquid paraffin.

In the first configuration of the present invention, the glue for filling a root canal is a compound selected from chordform, barium sulfate, anhydrous zinc sulfate, aluminum sulfate, zinc oxide, silicone oil, guaiacol formaldehyde mixture, propylene glycol, anhydrous It preferably contains a vehicle selected from ethanol, castor oil, and liquid paraffin.

In the first configuration of the present invention, it is preferable that the glue for filling a root canal contains an X-ray contrast agent.

In the first configuration of the present invention, it is preferable to add 5 to 50% by weight of a conductive material based on the solid content of the glue for filling a root canal.

In the first configuration of the present invention, the glue for filling a root canal contains a compound selected from calcium hydroxide, hydroxyapatite, and tricalcium phosphate in an amount of 30% by weight or more based on the solid content of the glue for filling a root canal. It is preferred to contain.

In the second configuration of the present invention, a storage section for storing the conductive glue, a press-fitting section inserted into the storage section, a filling section for filling the narrow section with the conductive glue, A conductive member for connecting the paste to the external electrode; and a paste injector for dental treatment.

In the second configuration of the present invention, the conductive member includes a terminal that is exposed on an end face of the press-fitting portion inserted into the paste housing portion and contacts the conductive glue; and a press-fit portion provided in the press-fitting portion. It is preferable that the terminal be composed of a terminal exposed to the outside and a lead wire connecting the terminals.

In the second configuration of the present invention, it is preferable that the conductive member is penetrated into the press-fit portion.

In the second configuration of the present invention, the conductive member includes an end extending to the inner passage of the filling portion, an end exposed to the outside of the glue injector, and an end of each end. It is preferable to provide a lead wire for connecting between them.

According to a third configuration of the present invention, a paste injector that contains a conductive paste therein and includes a conductive member for electrically connecting the conductive paste to an external electrode; And a current indicator for indicating a current flowing through the conductive glue, and a current detector for measuring a current flowing through the conductive glue. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a glue injector according to the present invention.

FIG. 2 is a diagram showing a detailed portion of the glue injector of the present invention.

FIG. 3 is a view showing a second embodiment of the glue injector of the present invention.

FIG. 4 is a diagram showing the configuration of an apparatus for impedance measurement conventionally used for measuring the working length in the past.

FIG. 5 is a diagram showing a method for measuring a root canal length by impedance measurement using a reamer.

FIG. 6 is a diagram showing a configuration when filling a conductive glue D into a root canal of a diseased tooth using the glue injector according to the first embodiment of the present invention.

FIG. 5 is a view showing a state in which a root canal is filled with a conductive paste by using the paste injector according to the second embodiment of the present invention and having the same configuration as that of FIG.

FIG. 8 is a diagram showing an electric circuit configuration used for testing the paste of the present invention.

FIG. 9 is a diagram showing a method of filling a paste using a conventional syringe. BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides a conductive paste for dental treatment, that is, a conductive paste, a paste injector used for filling the paste, and a paste filling detecting device. Things. Hereinafter, the conductive glue, the glue injector, and the glue filling detection device will be described in detail with reference to the drawings as necessary.

As the conductive paste of the present invention, a conductive paste suitable for the conventional compositions for producing calcium hydroxide paste, zinc oxide glue paste, chodeform paste and paraform / formalin paste is used. It can be manufactured by kneading materials. As for these conventional paste compositions, specifically, commercially available products include powders of paraformaldehyde such as trio zinc pasta, anhydrous zinc sulfate, aluminum sulfate, potassium sulfate, and zinc oxide powders such as cresol, phenol and creo. Kri 1 kneaded for sorting Powders such as hordeform powder, parachlorophenol camphor, menthol, lanolin, darinsene kneaded, carbital, etc., powders such as hordeform, calcium hydroxide, sulfatiazol, guanofuracin, T-force, Calcium iodide powder, kneaded form powder kneaded with silicone oil, powders such as FR, such as calcium hydroxide, zinc oxide, and barium sulfate, are mixed with guaiacol formaldehyde mixture, propylene glycol, anhydrous ethanol, castor oil, and liquid paraffin. And those containing a polymerization resin such as Seal apex and calcium hydroxide.

In addition, a paste using a polymer material such as Endo fi 11 as a base material and a paste using hydroxyapatite or tricalcium phosphate also have an affinity for living tissue, It can be used because it has the effect of promoting the formation of hard tissue and absorbs even if it overflows through the apical foramen. The content of the above-mentioned calcium hydroxide, hide mouth xixapatite, and tricalcium phosphate is preferably 30% by weight or more, and more preferably 50% by weight or more, of the solid content contained in the conductive paste. Is preferred.

As the conductive material that can be used in the present invention, it is preferable to use a conductive powder so that the paste can be sufficiently kneaded with the paste having the above-described composition. Such a conductive powder has a particle diameter of, for example, about 200 A to 100 in terms of volume average particle diameter, more preferably 0.01 to 80 m, and further preferably 10 to 50 m. It is preferable to set it to about m in order to perform good filling. Further, as for the shape of the conductive powder, various kinds of powder such as sphere, needle, and scale can be used.

These powders, in particular, gold powder, silver powder, copper powder, metal powder such as nickel powder, Z n O, S N_〇 _{_{_{2, I 2 0 3, ITO}}} , metal oxides such as S n O ₂ the powder, these metal oxide powders anti Monde one flop like conductive as needed, those subjected to various doping, B a S 0 ₄ conductive such metals and S n 0 ₂ in the powder those coated with wood charge, T i 0 ₂ powder particle surface were co one coating in a g, powder T I_〇 ₂ coated with S n 0 _2, conductive carbon black, potassium titanate Powder was fixed with A g and P d in Umuuisu force of all, the powder coated with conductive S n 0 ₂ in Uisuka, acicular powder such high § scan Bae transfected ratio of conductive carbon whisker, First Can be mentioned. In particular, by using needle-like powder, the volume resistivity of the conductive paste can be improved even with a small amount of addition.

The volume resistivity of the above conductive paste agent, it is possible to ^{^{1 0- 2 Ω cm~ 1 0 6}} Ω cm, the resistance value of the conductive paste material upon filling the root canal portion root It is preferable that a resistance value approximately equal to the resistance value through the membrane can be given. As described below, if the volume resistivity is too high, the detection of filling to the root canal stenosis by resistance measurement may not be performed with sufficient accuracy.

The amount of the above-mentioned conductive powder to be added to the conductive paste of the present invention can be appropriately set so that a necessary volume resistivity can be given to the conductive paste. It is preferably added in the range of 5% by weight to 50% by weight based on the solid content contained in the conductive paste, and more preferably 10% by weight to 30% by weight based on the solid content of the conductive paste. % Is preferably added.

The content of the above-mentioned vehicle contained in the conductive paste is from 10% by weight to 70% by weight of the conductive paste, more preferably from 30% by weight to 60% by weight. Can be.

Hereinafter, an embodiment of the present invention in which a conductive metal powder is added to a paste mainly containing calcium hydroxide will be described.

First, prepare calcium hydroxide. As the calcium hydroxide, those of the Japanese Pharmacopoeia can be used, and those having a particle size of 10 to 50 m are used.

Preferably, iodoform is added to the conductive paste. This is because the addition of eordholm significantly enhances the antibacterial properties of the paste and improves the X-ray contrast. Further, the above-mentioned vehicle such as silicone oil is added to calcium hydroxide. The addition of silicone yl makes it possible to impart the corrosion resistance of the sizing agent and to impart appropriate fluidity.

Various other additives are used for calcium hydroxide. For example, X-ray contrast agents such as bismuth subcarbonate, bismuth sulfate, and zirconium silicate are used. In addition, X-ray contrast can be improved.

In dispersing each powder, any conventionally known dispersion method can be used. In particular, when using conductive powder having a particle size in the range of 10!]! To 50m as described above, since the cohesiveness of the powder is not so high, various mixing / dispersion methods should be used. Is possible. In order to prepare the conductive paste of the present invention, for example, calcium hydroxide is added in advance with kneaded form and silicone oil and kneaded to form a base, and then conductive powder is added and kneaded again. By doing so, a conductive paste can be obtained, and the conductive paste thus obtained can be stored in a syringe-shaped injector and used as needed. However, if the conductive paste of the present invention is obtained, the non-conductive powder such as calcium hydroxide and the conductive powder can be simultaneously kneaded with a vehicle such as silicone oil. In the above-described embodiment of the present invention, for example, a conductive powder such as gold, silver, copper, or nickel powder having the above-described particle size range can be added to obtain the conductivity in the above-described range. In this way, the paste is given conductivity, and the paste is filled into the root canal with an injector equipped with a conductive member, and the glue is properly filled into the root canal by measuring the resistance. You can confirm that. Further, by adding the conductive powder to the sizing agent, the heat conductivity of the sizing agent itself can be improved, and a good feeling of heat and electro sensation can be obtained. In particular, when carbon powder is used, it has an effect of absorbing formaldehyde, which is a main component of formcresol used in treating root canals.

An embodiment of a glue injector for filling a conductive glue of the present invention into a root canal and simultaneously enabling resistance measurement will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing a glue injector 1 according to a first embodiment of the present invention. The injector 1 includes a conductive glue storage section 2, a press-fitting section 3 that can be inserted into the storage section 2, and a filling section 4 formed in a tapered tube shape disposed at the distal end of the storage section 2. And a seal member 5 provided on the side of the press-fitting portion 3 inserted into the housing portion 2.

The storage section 2 and the press-fitting section 3 described above can be formed using a synthetic resin such as glass, polypropylene, polycarbonate, or polyvinyl chloride. , Polycarbonate, poly salt It is preferably formed of a synthetic resin material such as vinyl. The storage part 2 has a hollow inside, and this hollow part is filled with a conductive paste. The storage section 2 is provided with a jaw 2 a on the side opposite to the filling section 4, so that a finger can be applied at the time of press-fitting to facilitate the press-fitting of the press-fitting section 3. . The material for forming the filling portion 4 can be formed from various materials as long as the material is thin and flexible so that the tapered tube shape of the filling portion 4 can be inserted into the root canal. It is.

The press-fit portion 3 is used to push out the conductive glue stored in the storage portion 2, and a seal member 5 provided at an end of the press-fit portion 3 is used to seal the inner surface of the storage portion 2 with the press-fit portion 3. The seal between them has been improved. Various methods can be used to attach the seal member 5 to the press-fitting portion 3. For example, a method of attaching the pipe-shaped seal member 5 to a portion of the press-fit portion 3 having a small diameter, A method of integrally forming a sealing member 5 made of a synthetic resin around the periphery can be given.

At the end opposite to the side where the press-fitting part 3 is inserted into the storage part 2, there is provided a protruding part 3a that protrudes beyond the diameter of the press-fitting part 3, so that the root canal is filled with the conductive glue. In doing so, it is easy to apply force with your fingers. The protruding portion 3 a may be formed separately from the press-fit portion 3 and adhered to the press-fit portion, or may be formed integrally with the press-fit portion 3. When filling the root canal with the conductive glue, hold the glue injector 1 as described above in one hand, sandwich the jaw 2a and the protrusion 3a between the fingers, and apply force to the root. A conductive glue is pressed into the tube.

As shown in FIG. 1, a conductive member is incorporated in the press-fitting portion 3 of the glue injector 1 according to the first embodiment of the present invention. The conductive member includes an end 6, a terminal 7, an end 8, an terminal 9, and a lead wire 10 extending between the end 6 and the end 7. In these components, the end 6 is connected to a terminal 7 formed on the side of the sealing member 5 that contacts the conductive paste, and the other end 8 is connected to the protrusion 3 a of the press-fitting portion 3. It is shown that a lead wire 10 is passed through the press-fitting portion 3 so as to be connected to a terminal 9 drawn out of the press-fitting portion 3 to the outside of the press-fitting portion 3 to be a conductive member. By inserting the lead wire 10 into the press-fit portion 3 in this manner, the conductive glue is It is configured to be electrically connected to the unit. These lead wires 10 and terminals 7 and 9 can be mounted by insert molding at the time of molding the press-fitted portion 3 or by incorporating them after molding of the press-fitted portion 3.

FIG. 2 is an enlarged view showing details of the terminal mounting portion of the terminal 9 of the glue injector 1 according to the first embodiment of the present invention. FIG. 2 (a) is an enlarged view of the press-fit portion 3 including the terminal 9, and in FIG. 2 (a), the terminal 9 extends from a position close to the protrusion 3a to the outside of the press-fit portion 3. The terminal 9 is shown to protrude, and the electrode section 6 is connected to the terminal 9 via a clip. In addition, FIG. 2 (b) shows that the terminal 9 is disposed inside the protrusion 3a and protrudes from the side of the protrusion 3a to the outside of the press-fit portion 3. FIG. 2 (c) shows that the terminal 9 has an opening 11 open to the outside of the press-fitting portion 3 so that a needle-shaped electrode can be inserted or screwed into the terminal. FIG. 2D shows that the terminal 9 is configured to protrude and extend along the circumferential direction of the press-fit portion 3 at a position close to the protrusion 3a of the press-fit portion 3. I have. The configuration of the terminal 9 shown in FIG. 2 can be appropriately selected in consideration of the operability and the operability in performing the root canal filling operation, and the configuration of FIGS. 2 (a) to 2 (d) can be selected. It is also possible to use them in appropriate combinations.

FIG. 3 is a view showing a second embodiment of the glue injector 1 of the present invention. FIG. 3 (a) is a partially cut-away side view of the glue injector 1 according to the second embodiment of the present invention. Like the glue injector 1 shown in FIG. The container includes a press-fitting portion 3 that can be inserted into the storage portion 2 and a filling portion 4 that is disposed at the tip of the storage portion 2 and that is formed in a tapered tube shape. FIG. 3 (a) shows that the conductive glue D is accommodated in the accommodating part 2 by cutting out a part thereof. In the filling part 4 of the glue injector 1 according to the second embodiment of the present invention, a lead wire 10 protrudes from the vicinity of the bent part to the outside of the glue injector 1, and the tip part of the filling part 4 is The distance between the ends of the lead wire 10 is shorter than that of the glue injector 1 shown in Embodiment 1, and the influence of the resistance of the conductive glue D on the resistance measurement is reduced.

FIG. 3 (b) shows an enlarged view of the vicinity of the bent portion of the injection part 4 of the glue injector 1 shown in FIG. 2 (a). The second embodiment of the present invention shown in FIG. The glue injecting device 1 is located at the leading end from the lead wire introduction portion of the filling portion 4 as necessary so that the end portion 6 can be arranged as close as possible to the tip end where the conductive glue D is injected. The lead wire 10 may extend along the inner passage 4 a of the filling portion 4 in a direction adjacent to the portion. By doing so, the distance between the end portion 6 and the other electrode portion 104 (not shown) of the resistance measuring device through the conductive paste D is reduced, so that the resistance value of the conductive paste D is reduced. The influence on the resistance measurement can be reduced. When drawing out the lead wire 10 from the glue injector 1 according to the second embodiment of the present invention shown in FIG. 3, the terminal 9 shown in FIG. Also, without providing the terminal 9, the both ends of the lead wire 10 are exposed so that sufficient conductivity can be obtained, and one end is disposed in the inner passage 4a, and the other end is sufficiently provided. It can also be drawn out of the filling portion wall 4c while sealing is performed using sealing means such as heat sealing or an adhesive 4b. Further, it is also possible to form the filling portion 4 integrally when forming the filling portion 4. The lead wire 10 pulled out to the floor of the glue injector 1 in this manner is placed along the outer side of the glue injector 1 so that the bare end does not come into contact with the oral cavity. The jaw 2 can be extended to the vicinity of 2a, from which the electrode of the resistance measuring device can be connected. The lead wire 10 used for this purpose may be of any thickness, but it should be as operable as possible, and should be as thin as possible so as not to impair the filling in the filling section 4. It is preferable to use a lead wire. The lead wire 10 may or may not be covered.

The glue filling detection device for the conductive glue D of the present invention will be described below with reference to FIGS. 4, 5, 6, and 7. FIG. FIG. 4 is a diagram showing an apparatus configuration for resistance measurement conventionally used for measuring root canal length. When measuring the root canal length by resistance measurement, after performing an operation to expand the root canal of the diseased tooth T, the expanded root canal 21 is cleaned with hydrogen peroxide solution, and slightly overheated. The reamer 20 is inserted into the root canal 21 with the hydrogen oxide water remaining.

The resistance measuring device 100 includes a current detector 101, a power supply 102, a control circuit 103 having a relay circuit, and an electrode unit 10 connected to the diseased tooth T via a lip. 4, and It has a current indicating device 105 composed of a flow display device and / or an alarm device, or both of them, and an electrode portion 106 connected to an end of the reamer 20. The resistance measuring device 100 operates a current indicating device 105 by a control device 103 including a relay circuit based on the current signal detected by the current detector 101, and provides a predetermined value to a practitioner. That the resistance or current value of the reamer 20 has reached a predetermined value, and that the tip of the reamer 20 has reached the root canal constriction P or a predetermined distance from the root canal constriction P, that is, about 1 mm. It is configured as follows.

Normally, when the reamer 20 reaches the periodontal ligament, the electric circuit formed through the reamer 20 and the salivary duct connected to the labial area has an internal resistance of the resistance measuring device 100. Is known to have a resistance of 6.5. Figure 5 shows this schematically. FIG. 5 shows the resistance value of the reamer 20 as R1. As shown in FIG. 5, the reamer 20, the periodontal ligament, and the electrode 104 connected to the salivary duct, usually connected to the lip, constitute an electric circuit having a resistance R 1. You. Normally, since the inside of the root canal into which the reamer 20 is inserted is cleaned and the measurement is performed in a state close to a dry state, almost no current flows until the root canal is approached. However, as the tip of the reamer approached the periodontal ligament, current began to flow due to the effects of exudate, etc., or the residual hydrogen peroxide used during cleaning and the small amount of hydrogen peroxide. When 20 reaches the periodontal ligament, the resistance value of the entire circuit becomes 6.5 kΩ as described above.

The glue filling detection device of the present invention uses the conductive glue D as a probe electrode instead of using the reamer 20 as a probe electrode for root canal length measurement.

FIG. 6 is a view showing a configuration when the conductive glue D is filled into the root canal 21 of the diseased tooth T using the glue injector 1 of the first embodiment of the present invention. As shown in FIG. 6, the terminal 9 is connected to the electrode unit 106 of the resistance measuring device 100, and the electrode unit 104 of the resistance measuring device 100 is connected to the salivary duct. . In the state shown in FIG. 6, no current flows through the current detector 101 as described above, and the resistance remains high.

FIG. 7 is a diagram showing a state that the root canal 21 is filled with the conductive glue D using the same configuration as that of FIG. 6 using the glue injector 1 of the second embodiment of the present invention. . Shown in Figure 6 As shown, when the filling of the conductive paste D progresses and approaches the root canal stenosis P, a weak current starts to flow through the conductive paste D. Finally, when the conductive glue D comes into contact with the periodontal ligament, the resistance R 1 of the reamer 20 becomes the distance between the position where the lead wire 10 contacts the conductive glue D in the filling part 4 and the periodontal ligament. Is replaced by the resistance R 2 of the conductive glue determined according to Therefore, the detection that the conductive glue D has been filled into the root canal constriction P can be determined by the fact that the resistance value becomes (6.5 kQ-R1 + R2). Separately, using a conductive powder mainly composed of a conductive metal or metal oxide, the distance between the conductive paste D from the periodontal ligament and the resistance value is determined in advance by X-ray photography or the like. By measuring the relationship, it is also possible to estimate the distance from the periodontal ligament when a predetermined resistance value higher than (6.5 k Q-R 1 + R 2) is reached. As described above, in the present invention, since the glue filling the root canal is used as the current probe, the filling of the root canal with the glue is immediately completed if it is confirmed that the above-described resistance value has been reached. It can be determined. In this way, the conventional work of measuring the root canal length by impedance measurement, and then further expanding the root canal and inserting a gutta-pa-chair point to fill the root canal is performed. In addition to the fact that it is no longer necessary, it is easy to detect whether or not the inside of the root canal has been completely filled with glue, which was difficult in conventional root canal filling procedures using glue. In other words, it is possible to provide a quicker, simpler and more reliable glue filling detection device than ever before. The power supply 102 used may be DC or AC, and the value of R 2 and the internal resistance of the resistance measuring device and the like can be appropriately set. In the above-described measurement method and the like, resistance measurement or impedance measurement can be used according to the type of the power supply 102 to be used. It is also possible to alert the practitioner by generating an alarm when the prescribed working length is reached.

Hereinafter, the present invention will be further described with reference to examples. The following examples are intended to illustrate, but not limit, the invention.

(Example 1)

Calcium hydroxide (Wako Pure Chemical Industries, Ltd.) 50% by weight of solid content consisting of 50% by weight of eodohol and 30% by weight of silicone oil are kneaded to paste paste And

This paste paste was further kneaded with 10% by weight of silver powder based on the solid content. It was confirmed by the ammeter that a current of 5 mA flowed through the obtained conductive paste. Then, a heated 0.1 mm lead wire was inserted into the filling portion of a commercially available glue syringe to prepare a glue injection syringe which is the glue injector of the present invention shown in FIG. The conductive paste produced as described above was filled into the syringe for filling paste, and it was confirmed that the conductive paste was discharged from the tip.

The circuit shown in FIG. 8 is constructed using the above-mentioned conductive glue using unpulled teeth extracted from a patient, and is injected into the root canal 21 using the above-described syringe for injecting glue. Filling was performed. At this time, the tip of the electrode portion 104 of the resistance measuring device 100 was disposed at a position slightly beyond the root canal stenosis P into the root canal 21. When the introduction of the conductive paste was started and the introduction was continued, it was confirmed by the current detector 101 that a current flowed.

After that, the filling part of the glue injection syringe was carefully extracted from the non-medullary teeth, and X-ray imaging was performed to observe the filling state of the conductive paste.The conductive paste reached the root canal stenosis. It was confirmed that. In other words, by detecting that the conductive glue has reached the root canal constriction and that a circuit has been formed via the conductive glue, the root canal filling operation is performed and the root canal constriction is simultaneously detected. It was possible to detect that the paste was filled.

(Example 2)

40% by weight of hydroxyapatite, 10% by weight of barium sulfate and 50% by weight of silicone roll were kneaded to obtain a paste-like paste.

25% by weight of gold powder was further kneaded with the above paste-like paste. It was confirmed by a galvanometer that a current of 3 mA flows through the obtained paste.

A test was conducted using this conductive paste in the same manner as in Example 1, and it was confirmed that the conductive paste was filled even in the root canal stenosis of the affected tooth. Industrial applicability As described above, in the present invention, the glue filling the root canal is used as a current probe, so if it is confirmed that the above-mentioned resistance value has been reached, the filling of the root canal with glue is immediately terminated. You can judge that. This eliminates the need for the conventional work of measuring the working length by impedance measurement, then expanding the root canal, inserting a gappercha point, and filling the root canal as in the past. In addition, it has been difficult to perform a root canal filling operation using a conventional paste, and it is possible to easily detect whether or not the inside of the root canal is completely filled with the paste. The use of the conductive paste, paste injector and paste filling detection device of the present invention can provide a quicker, simpler and more reliable root canal filling detector than ever before.

Claims

Scope of Claim 1. Dental paste characterized by adding a conductive material to the root canal filling paste.

2. The dental paste according to claim 1, wherein the conductive material is a powder.

3. The conductive material is a metal powder, a metal oxide powder, a doped metal oxide powder, or an inorganic particle coated with a conductive material selected from a metal, a metal oxide, and a doped metal oxide. 2. The dental paste according to claim 1, wherein the paste is selected from the group consisting of conductive powder, carbon powder, carbon whiskers, and whiskers to which a metal is fixed.

4. The dental paste according to claim 1, wherein the paste for filling a root canal contains a compound selected from calcium hydroxide, hydroxyapatite, and triphosphate calcium phosphate.

5. The dental paste according to claim 1, wherein the paste for filling a root canal contains a compound selected from chondform, barium sulfate, anhydrous zinc sulfate, aluminum sulfate, and zinc oxide.

6. The dental paste according to claim 1, wherein the paste for filling a root canal contains a vehicle selected from silicone oil, guaiacol formaldehyde mixture, propylene glycol, anhydrous ethanol, castor oil, and liquid paraffin.

7. The glue for filling the root canal is a compound selected from eodoform, barium sulfate, anhydrous zinc sulfate, aluminum sulfate, zinc oxide and silicone oil, guaiacole formaldehyde mixture, propylene glycol, anhydrous ethanol, castor oil. The dental paste according to claim 5, further comprising a vehicle selected from liquid paraffin.

8. The dental paste according to claim 1, wherein the paste for filling a root canal contains an X-ray contrast agent.

9. The dental paste according to claim 1, wherein a conductive material is added in an amount of 5 to 50% by weight based on the solid content of the paste for filling a root canal.

10. The root canal filling agent contains a compound selected from calcium hydroxide, hydroxyapatite and tricalcium phosphate in an amount of 30% by weight or more based on the solid content of the root canal filling agent. The dental paste according to claim 1.

11. A storage section for storing the conductive paste, a press-fitting section inserted into the storage section, a filling section for filling the conductive paste into the constricted portion, and the conductive paste for an external electrode. A glue injector for dental treatment, comprising: a conductive member for connection.

12. The conductive member is exposed on an end face of the press-fitting portion inserted into the glue accommodating portion and is in contact with the conductive glue; and a terminal provided on the press-fitting portion and exposed to the outside of the press-fitting portion. The glue injector according to claim 11, further comprising: a lead wire connecting between the terminals.

13. The paste injector according to claim 12, wherein the conductive member is penetrated into the press-fit portion.

1 4. The conductive member has an end extending into an inner passage of the filling portion, an end exposed to the outside of the glue injector, and a lead wire connecting between the ends. The glue injector according to claim 11, comprising:

15. A glue injector that contains a conductive glue therein and has a conductive member for electrically connecting the conductive glue to an external electrode, and the conductive glue filled in a constricted portion. A glue filling detecting device comprising: a current detector for measuring a current flowing through the conductive glue; and a current indicating device indicating a current flowing through the conductive glue.